–How did you go to school this morning, Susan?--I ______ the school bus. Luckily, Ted’s father gave me a ride.
I’ve ____ met her before, so I don’t know her.
--- ____ have you been a member of Greener China? --- For two years.
--- Have you ____ your key? --- No, I’ve ____ for it everywhere, but I can’t find it.
My brother always ____ his lesson, so he is a top student.
The dog is very ___, and it can work out the problem____.